Bushing for polishing wheels



July 9, 1946 J. `I.jvlArum-:RsczHEnD 2,403,813

` BUsHING's FOR PoLIsHING WHEELS Filed July 24, 1944 Patented July 9, 1946 UNITED STAT ES PATENT OF FICE BUsHING FOR PoLIsHING WHEELS James J. Manderscheid, Chicago, Ill. v application July 24, 1944, serial No. 546.425A

, The present invention relates to polishing wheels and especially toa novel light weight bushing that may be readily inserted and perf manently anchored in the opening in such polishing wheels.

Polishing wheels now on the, market are each provided with a centrally disposed opening appr'oXimately" 1A; inch less in diameter than the .s claims. (C1. 51-168) Among the objects of the present invention is y to provide a novel construction Aof bushing for a polishing WheelV that may be safely, kreadily and easily mounted in a polishing wheel whetherl old or new. It adds Very little to the cost of the polishing WheelY and when inserted,v is autot matically and rigidly connected thereto in operative relation. A polishing wheel equipped with the novel bushing is concentric throughout its entire circumference, is accurately balanced and thereby completely eliminates all chatter or uneven wearing surfaces. The Work being polished with a wheel provided with the present bushing, will touch the face Vof the wheel along the entire circumference and thereby causing'theemery or abrasive to wear uniformly and avoid all waste.

In the assembly of a. polishing Wheel equipped with the present novel bushing, it may be slipped over the polishing lathe spindle while the latter is stationary, so that neither the Wheel nor the machine is turning when the former is placed on the spindle. Furthermore, the wheel is not forced over the threads either in putting it on or taking it off and thus no wear or damage on the spindle results.

The present invention contemplates making the bushings in certain standard spindle sizes such as ,1, 11/4, 1,1/2, 1% and 2 inches in diameter, all with an inside tolerance of approximately plus .003. For example, abushing that is to be tted onto a spindle of 11A inch diameter, the .inside .dimension of the Abushing is 1% plus .O03 or 1.253 inches in diameter. The bushing although preferably made of suitable metal of relatively light weight having sufficient strength and rigidity to prevent distortion, may 'be constructed of any other material including plastic, rubber or other v,composition suitable for the purpose and having the desired rigidity and inherent. strength. '.The present inventiony further comprehends a novel manner 'of anchoring the bushing onto `the polishing wheel-to thereby prevent'it from comingout or turning in the wheel. y i' Y Further objects are to provide a construction of maximum' simplicity, efficiency, economy and ease of assembly and operation, and such further objects, advantages and capabilities vas will later more fully appear and areinherently possessed thereby.

The invention further resides in the construction, combination and arrangement of parts illustrated in the accompanying drawing, and while there is shown therein a preferred embodiment, it is to be understood that the same is susceptible of modification and change, and comprehends other details, arrangements of parts, features and constructions without departing from the spirit of the invention.

Inthe drawing:

Figure` 1 is aview in perspective of thenovel bushing.

Figure 2 is an enlarged view in vertical cross section through the bushing. t

Figure 3 is an enlargedview in side elevation of the polishing lathe spindle and showing-the manner yin which a pair of bushings Vmayfbe mounted in a polishing Wheel4 byusing theA polishing lathe spindle as ascrewpress. v

Figure 4 is a fragmentary View similar to Figure Sbut showing the bushings vassembled and forced intooperative position in thel polishing wheel. .f f j Figurev 5 is a View in side elevation showing a-single bushingl mounted in position and the polishingv wheel so spindle..

Referring moreA particularly to the disclosure in the drawing, the novel embodiment selected to illustrate the invention comprises a bushing I having a cylindrical hub or collar Zand a peripheral flange 3, the hub or collar beingV provided with a plurality ofsubstantially triangular upstanding projections or notches 4 adapted Yto be 'embedded in the materialof the rpolishing wheel 5 and thereby permanently and rigidly anchor the bushingwin place. To facilitate insertion and to guide the hub or collar of the bushing into the opening in the polishing wheel, the edge of this hub or collar is tapered or feathered at 6.

In the assembly of the bushing I in the polishing Wheel, it may be pressed into the opening 1 of either a new or old wheel by any suitable equipped assembled on the means. One method that may be employed is to use the polishing lathe spindle 8 as a screw press. All that is required is to reverse the flanges 9 and IE! as shown in Figure 3 and by tightening the nut l l, the bushing or bushings are forced into the opening 1 and anchored therein by the projections, notches or tongues 4 as shown in Figure 4. Thereafter the nut il is backed off or unthreaded, and flange i0, polishingY wheel and flange, 9 removed in sequence. The flange 9 is then reversed and again applied to the spindle, after which the polishing Wheel is slipped over the spindle, the ange I0 applied and the nut Il drawn tight to lock the polishing wheel in operative position as shown in Figure 5, where a single bushing is employed. Generally but one bushing need be employed, butV wherethe thickness of the Wheel warrants, two may be applied.

These bushings are of light weight material such as approximately 16 gage drawn steel, althoughfany other metal, or other substance including plastics, hard rubber or rubber-like compositionshaving sufficient inherent strength and rigidity to withstand thev conditions of operation, may be used.l

Whereas by theold method it was necessary to. bore an opening approximately 1/8 inch. less in' diameter than the diameter of the spindle on *which` the Wheel was mounted, and to then spin -the' motor lathe spindle to mount thewheel, by the'use-of the present novel bushing, the wheels are bored to the-size of the spindleand thewheel applied with the spindle stationary. For eX- ample, if a polishing Wheel is to bemounted on a 11/4 inch spindle, the opening lI is bored to that .diameter and a 1% inchbushing is inserted. As this bushingY has an internal diameter of approximately v.003 inch larger than the diameter of the spindle, itis not forced over thespindle and there is-no danger of damage theretoregardless of how often the Wheel is assembled or replaced; Furthermore, as the wheel is applied to thespindle when stationary, there is no danger to the operator.

The hub or collar 2 is of such construction and length that the Wheel is properlyrcentered at all times. and-under all operating conditions. In the prior` devices where the polishing wheel was pro.- vided witlraA smaller hole fitted or threaded over a larger spindle, considerable friction resulted which not only caused wearV on the spindle but also distortedthehole or openingA so that the Wheel would be looseor hang onuthe spindle. The wheelbeingout of' balance necessarily resulted in chatter.

The present novel bushing has universal applicationl to anyl of thel Various types-oi? polishing wheels now onl the market regardless of the material of which the wheel is made, and islof such inexpensive construction that it adds but little to thecost oithe wheel.

Havingl thus disclosed my inventiony I claim.:

i 1. A- bushing adapted to be pressed intoand automatically locked in a centrally disposedopening in a preformed polishing wheel, consisting of a member formedV of relatively thin gauge metal and provided with a peripheral flange and a hub portion, the latter adapted to be pressed into the opening and anchoring projections formed from the material of the hub and adapted to embed in the material of the wheel as the bushing is pressed into the opening.

2. A bushing adapted to be readily and easily inserted and anchored in the opening of a preformedl and standard construction of polishing wheel, comprising a collar adapted to1 be pressed into the opening and of such length as to accurately mount the bushing in the opening and maintain the concentricity of the wheel, a flange formed at one end only of the collar and adapted to bear against aface of the Wheel, and spaced projections on the circumference of the collar which' become embedded in the material of the wheel when the collar is forced into the opening and thereby anchoring the bushing in the wheel.

3. A bushing adapted to be mounted in a centrally disposed openingv in a new yor old polishing wheel, consistingV of* a member formedv of. a light vweight substantially rigid-material providing Va collar adapted to be forced into the opening, a i flange at one end of the collar adapted' to seat against a side of the Wheel' as the collar of the bushing is forced into the opening, and means on the collar for anchoring it into the material of the wheel surrounding the opening when the collar is forced into this opening.

4. In a standard' construction of polishing wheel adapted to be mounted on a lathe spindle and provided with a centrally disposed opening, a bushing having a hub adapted t0 be received in the opening, spaced projections on the hub adapted tofoecorney embeddedv in the material of the wheel when the hub is pressed into the opening for anchoring the bushingtherein, and a peripheral flange on onel end only ofy the hub for locating the bushing in the wheel adapted to abut against a side of4v the wheel when the hub is pressed into the opening.

5. A bushing adapted to be readilymounted in either a new or oldpolishing wheelby.` the user, consisting of a collar adapted toloerpressed into the opening and' an integral flange at one end only of the collarand abutting against aside of the wheel when the collar is inserted to its proper depth, said collar being provided with a plurality of notches with integral projections so disposed as to anchor in the material ofthe wheel for securing together the wheel andv bushingV and preventing the bushing from turning inthe wheel.

6. A bushing adapted to be readily assembled in` anopening ina new orold polishing Wheel, comprising a collar having an annular, peripheral flange at one end andl its other end tapered to facilitate assembly and to guide the collar into the opening, projections formed from the material of the collar and projecting/outwardly therefrom in suchimanner that as the collar ispressed into the opening, these projections interlock with the material of the wheel and` preventunintentional removal or turning ofl the bushing inthe opening.

JAMES-J'. MANDERSCHEID. 

